package com.xmcc.utill;

import java.security.MessageDigest;

public class MD5Utils {
    public final static String calc(String ss) {//MD5加密算法
        String s = ss == null ? "" : ss;//如果为空，则返回""
        char hexDigists[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
                'e', 'f'};//字典

        try {
            byte[] strTemp = s.getBytes();//获取二进制
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);//执行加密
            byte[] md = mdTemp.digest();//加密结果
            int j = md.length;//结果长度
            char str[] = new char[j * 2];//字符数组
            int k = 0;
            for (int i = 0; i < j; i++) { //将二进制加密结果转化为字符
                byte byte0 = md[i];
                str[k++] = hexDigists[byte0 >>> 4 & 0xf];
                str[k++] = hexDigists[byte0 & 0xf];
            }
            return new String(str);//输出加密后的字符
        } catch (Exception e) {
            // TODO Auto-generated catch block
            return null;
        }

    }
    public static void main(String[] args) {
        System.out.println(calc("12345678"));
    }

}
